Process for regenerating vulcanized rubber.



UNITED STATES PATENT OFFICE.

CHARLES PAUL BABY, OF PARIS, FRANCE, ASSIGNOR TO HENRY PIERRE CHARLES GEORGES DEBAU'GE, OF PARIS, FRANCE. I

PROCESS FOR REGENERATING VULCANIZED, RUBBER.

No Drawing.

1 Specification of Letters Patent.

Application filed may 1, 1912. Serial no. 694,567.

Patented Nov. 25, 1913.

To all whom it may concern:

Be it known that I, CHARLES PAULJBARY,

- oxid facilitates the devu canization of rubher by hot hydrocarbons or other solvents, byfixing the sulfur liberated in the change. The OXldS which were recommended are such as are capable of forming oxysulfids by combining with sulfur, such as oxids of iron, zinc, lead, copper or the like.

The present invention relates to an improvement in that described in the said specification in that the oxid used is one which contains so much oxygen as is necessary to oxidize the sulfur and form with it a sulfate of the metal, because the sulfate is insoluble in the solvent and is easily separated therefrom.

The simple oxids which contain a small quantity of ox gen do not permit the formation of sul ates; it is necessary to employ in this case the higher oxids of metals having more than one degree of oxidation, such as MnO,, PbO,, or the like; The reaction whereby the sulfur-is fixed is of the following form:

and

and

These examples show that the reaction is always of the same form; reduction of the oxid into another less oxygenated, and formation of sulfate.

Claim:

Improved process for devulcanizing rubber consisting in treating it with a solvent in presence, of a metal peroxid capable of signed my name in the presence of two sub-- scribing witnesses.

' CHARLES PAUL BABY. Witnesses:

H. C. Goxn, RENE BARDY. 

